摘要:
A multilevel converter including, in particular, a capacitor (C1, C2, . . . , Cn) for each of its cells, and control means comprising means (VMO1, VMO2, . . . , VMOn) for evaluating the mean voltage across the terminals of each of the capacitors (C1, C2, . . . , Cn), means (VE1, VE2, . . . , VEn) for measuring any difference on each of said capacitors (C1, C2, . . . , Cn) between the evaluated mean charge voltage and the nominal mean charge voltage of the capacitor, and additional control means (MCC1, MCC2, . . . , MCCn) changing the duration of said first conduction state of the cell associated with said capacitor in a direction such that the measured difference is reduced.
摘要:
A multilevel converter comprising, in particular, one capacitor (C1, C2, . . . , Cn) and two switches (T1, T'1; for example) in each of its cells. The cells operate successively in a period that repeats at a converter frequency. In parallel with the load (C), a filter circuit (CF) is provided to dissipate the energy of any component having a fundamental frequency that corresponds to said converter period. The filter comprises one or more RLC type series circuits.
摘要:
A multilevel converter including, in particular, a capacitor for each of its cells, and control means comprising means for evaluating the mean voltage across the terminals of each of the capacitors, means for measuring any difference on each of said capacitors between the evaluated mean charge voltage and the nominal mean charge voltage of the capacitor, and additional control means changing the time positions of the converter control signals in a direction such that the measured difference is reduced.
摘要:
A multilevel converter including, in particular, a capacitor (C1, C2, . . . , Cn) for each of its cells. The capacitors have nominal charge voltages proportional to their respective ranks in the converter. It also includes control means (BT, DA1, . . . , DAn, pe2, . . . , pen) organized to evaluate said voltage of the voltage source (VECn), and whenever it is insufficient, to suspend said nominal operation of the converter (SE) and to act on said switches (T1, T'1; T2; T'2; . . . ; Tn, T'n) in such a manner that initially, while said voltage of the voltage source is being established, it begins by charging all of the capacitors of the converter (C1, C2, . . . , Cn), after which said control means establish said nominal operation of the converter.
摘要翻译:PCT No.PCT / FR95 / 01748 Sec。 371日期:1996年7月23日 102(e)日期1996年7月23日PCT 1995年12月28日PCT PCT。 WO96 / 21267 PCT出版物 日期1996年7月11日一种多电平转换器,特别包括其每个电池的电容器(C1,C2,...,Cn)。 电容器具有与其在转换器中的相应等级成比例的标称充电电压。 它还包括组织以评估电压源(VECn)的所述电压的控制装置(BT,DA1,...,DAn,+ E,uns pe + EE 2,...,+ E,uns pe + EE n) ,并且每当不足时,暂停转换器(SE)的所述标称操作并且在这样的状态下作用于所述开关(T1,T'1; T2; T'2; ... Tn,T'n) 最初,当电压源的所述电压正在建立时,它开始对转换器(C1,C2,...,Cn)的所有电容器充电,之后所述控制装置建立转换器的所述标称操作 。
摘要:
A multilevel converter comprising, in particular, a capacitor (C1, C2, . . . , Cn) in each of its cells. The capacitors nominally have charge voltages proportional to their respective ranks in the converter. The converter also includes circuits (VMO1, VMO2, . . . , VMOn) for evaluating the mean voltage across the terminals of each of the capacitors (C1, C2, . . . , Cn), circuits (VE1, VE2, . . . , VEn) for measuring any difference that may occur with respect to each of the capacitors (C1, C2, . . . , Cn) between the evaluated mean charge voltage and the nominal mean charge voltage of the capacitor, and for providing a corresponding difference signal (VEC1, VEC2, . . . , VECn), and also correction control circuits (BT, EC1, EC2, . . . , ECn) receiving the difference signals and correspondingly causing at least one temporary coupling to be established between two capacitors in order to correct the difference.
摘要:
The invention relates to an on-load transformer tap changing system wherein the secondary or primary of a transformer comprises at least one first and one second taps (p1, p2). A main connection circuit (tra-I2) is used for the permanent connection of the first tap (p1) or the second tap (p2) to an output terminal (b2) of the secondary or primary of the transformer. Secondary connection circuits (I1, I3) are each used to connect a tap (p1, p2) temporarily and directly to said output terminal (b2) of the secondary or primary of the transformer. Each of said connection circuits (I1, tra-I2, I3) comprises one or more insulated gate bipolar transistors and the system can be controlled without zero current value transition detection in the secondary winding. Application: Power transformers.
摘要:
The control path of the switch (I) comprises an input stage (T2, T1) having an input (H) coupled to the input (E) for the control signal and having its output coupled to the control electrode (G) of the switch (I). A protection circuit (D1, Z2) coupled between the load (C) and the control path includes a threshold effect component (Z2) and a decoupling element (D1). On being made conductive by the current that results from a surge generated in a circuit of the load (C), the protection circuit (D1, Z2) is coupled to the input (H) of said input stage (T2, T1) to act on said switch (I) in the same way as a control signal for the switch (I). In this manner, the control path prevents current in the load (C) from dropping off suddenly.
摘要:
An on-load transformer tap changing system, for example for a power transformer, wherein the secondary or primary of a transformer includes at least one first tap and one second tap. A main connection circuit is used for permanent connection of the first tap or the second tap to an output terminal of the secondary or primary of the transformer. Secondary connection circuits are each used to connect a tap temporarily and directly to the output terminal of the secondary or primary of the transformer. Each of the connection circuits includes one or more insulated gate bipolar transistors. The system can be controlled without zero current value transition detection in the secondary winding.